How the Ford Rouge Plant uses science and scientific measurement to produce Ford cars. Circa 1939. Kind of sounds like Frank Nelson narrating but I don't think it is.
National Archives Identifier: 91522
and National Archives Identifier: 93353
"All rights were conveyed to the U.S. Government on Nov. 28, 1962. However, proprietary rights or existing copyright in footage obtained from other sources by Ford Motor Company may exist."